Automic VaultAutomic Vault

brew

libotr を Homebrew, apk, dnf, MacPorts, Nix, pacman, apt, zypper でインストール

libotr のインストール経路、実行ファイル、メタデータ、AI エージェント向けセキュリティノートを確認します。

インストールコマンドセキュリティノート

インストール

追加のインストールコマンド

macOS

Homebrew確認済み · 100%
brew install libotr

local Homebrew formula metadata

MacPorts確認済み · 94%
sudo port install libotr

MacPorts ports tree · security/libotr/Portfile · ソース: api.github.com

Linux

Alpine Linux apk確認済み · 92%
sudo apk add libotr

Alpine Linux edge package indexes · libotr · ソース: dl-cdn.alpinelinux.org

Fedora dnf確認済み · 92%
sudo dnf install libotr

Fedora Rawhide package metadata · libotr · ソース: dl.fedoraproject.org

Nix確認済み · 92%
nix profile install nixpkgs#libotr

nixpkgs package indexes · pkgs/by-name/li/libotr/package.nix · ソース: api.github.com

Arch Linux pacman確認済み · 92%
sudo pacman -S libotr

Arch Linux sync databases · libotr · ソース: geo.mirror.pkgbuild.com

Debian apt確認済み · 92%
sudo apt install libotr5-bin

Debian stable package indexes · libotr5-bin · ソース: deb.debian.org

openSUSE zypper確認済み · 92%
sudo zypper install libotr-devel

openSUSE Tumbleweed package metadata · libotr-devel · ソース: download.opensuse.org

概要

パッケージ概要

Off-The-Record (OTR) messaging library

コマンドとエイリアス

  • otr_mackey
  • otr_modify
  • otr_parse
  • otr_readforge
  • otr_remac
  • otr_sesskeys

履歴

プロジェクトの歴史と使われ方

libotr is the portable C library and toolkit for Off-the-Record Messaging, a protocol for private instant-messaging conversations with encryption, authentication during the conversation, deniability after the fact, and perfect forward secrecy.

プロジェクトの歴史

OTR came from academic and cypherpunk work on making instant messaging behave more like an off-the-record conversation than signed email. The official OTR site links the library, the Pidgin plugin, protocol descriptions, and the original research papers as one software-and-protocol family.

libotr served as the reference C implementation for client developers. The project paired the LGPL library with GPL toolkit programs and with pidgin-otr, making it practical for multiprotocol IM clients to add OTR without each client reimplementing the cryptographic state machine.

採用の歴史

OTR became especially associated with desktop XMPP and multiprotocol IM clients. XMPP Extension Protocol 0364 described OTR as the de facto standard for end-to-end encryption in XMPP, while the OTR site maintained user-facing downloads for pidgin-otr, source repositories, protocol documents, and implementation lists.

使われ方

Applications link libotr to negotiate OTR sessions, run the authenticated key exchange, encrypt and authenticate data messages, and expose higher-level verification flows such as the Socialist Millionaires' Protocol. The Homebrew package also installs toolkit programs for inspecting, modifying, and testing OTR message artifacts.

パッケージ好きにとっての重要性

libotr matters because it is a small library package carrying a big protocol story: it let package managers deliver interoperable deniable encryption to chat clients before modern app-specific encrypted messengers became dominant. Its 2016 security release also shows why distro maintainers cared about keeping even niche crypto libraries patched.

タイムライン

  • 2004: The OTR design was published in the WPES paper linked from the official OTR documentation.
  • 2012: libotr 4.0.0 and pidgin-otr 4.0.0 were released.
  • 2014: libotr 4.1.0 was released with build-system, secure-memory, constant-time comparison, and API changes.
  • 2016: libotr 4.1.1 fixed CVE-2016-2851 and tightened protocol parsing.

Related projects

  • pidgin-otr is the best-known client plugin distributed alongside libotr by the OTR project.
  • The OTR protocol documents define the wire protocol that libotr implements.
  • XMPP clients and multiprotocol IM clients were the main ecosystem where libotr was reused.

セキュリティ状態

リスクレベル: グリーン

library-like package without higher-risk signals.

リスク分類器

リスク グリーン · 信頼度 低 · appliance

理由

  • library-like package without higher-risk signals

信号

  • metadata:library-like

インストール挙動

  • formula メタデータに Homebrew post-install フックは記録されていません。
  • Homebrew bottle メタデータは 13 個のプラットフォームターゲットで利用できます。
  • 2 件の実行時依存関係とともにインストールされます。

推奨レビュー

エージェントに無人実行させる前に、このツールが平文の認証情報を読むか、リモート状態を書き込むか、成果物を公開するか、プラグインを起動するかを確認してください。

実行可能ファイル

インストールされる実行可能ファイル

コマンド種類公開範囲メモ
otr_mackeycliグローバル実行可能ファイル
otr_modifycliグローバル実行可能ファイル
otr_parsecliグローバル実行可能ファイル
otr_readforgecliグローバル実行可能ファイル
otr_remaccliグローバル実行可能ファイル
otr_sesskeyscliグローバル実行可能ファイル

鮮度

バージョンと鮮度

これらの信号は、ページ生成時期、パッケージマネージャの活動、上流リリース比較を分けて示します。バージョン遅れは、証拠 URL と比較可能なバージョンがある場合だけ警告されます。

ページ生成日2026-07-10
マネージャ版4.1.1
マネージャ更新日2026-06-19
ローカルデータOK
上流not checked
検出された最新未検出

https://otr.cypherpunks.ca/

インストールメタデータ

パッケージメタデータ

パッケージキーbrew:libotr
バージョン4.1.1
パッケージマネージャHomebrew
パッケージマネージャページhttps://formulae.brew.sh/formula/libotr
ホームページhttps://otr.cypherpunks.ca/
リポジトリhttps://bugs.otr.im/git/libotr.git
上流ドキュメントhttps://otr.cypherpunks.ca/
ライセンスLGPL-2.1-only AND GPL-2.0-only
ソースアーカイブhttps://otr.cypherpunks.ca/libotr-4.1.1.tar.gz
最終更新2026-06-19T12:32:38-07:00
Pulseupdated
依存関係libgcrypt, libgpg-error
Bottle利用可能 (対象 arm64_big_sur, arm64_linux, arm64_monterey, arm64_sequoia, arm64_sonoma, arm64_tahoe, arm64_ventura, big_sur, catalina, monterey, sonoma, ventura, x86_64_linux)
Homebrew post-install未定義
サービス宣言なし

レジストリ情報

ソースデータベース詳細

Source DatabaseHomebrew formula API
Taphomebrew/core
Full Namelibotr
Version Scheme0
Revision0
Bottle Stable Root URLhttps://ghcr.io/v2/homebrew/core
Deprecatedno
Disabledno
Keg Onlyno
URL Keys
  • stable

ソースデータベース一致

他のパッケージマネージャ記録

一致は外部パッケージマネージャインデックスから取得され、ローカルの Automic Vault パッケージリンクとは分けて表示されます。

Debian apt95%

libotr5-bin 4.1.1-6

toolkit for Off-the-Record Messaging library

https://otr.cypherpunks.ca/

sudo apt install libotr5-bin
  • Section: misc
  • Architecture: amd64
  • Source Package: libotr
  • 3 依存関係
  • normalized package name match
  • 一致条件: Libotr
Debian stable package indexes · deb.debian.org · Debian stable package indexes: libotr5-bin from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz
Debian apt95%

libotr5-dev 4.1.1-6

Off-the-Record Messaging library development files

https://otr.cypherpunks.ca/

sudo apt install libotr5-dev
  • Section: libdevel
  • Architecture: amd64
  • Source Package: libotr
  • 2 依存関係
  • 1 任意依存関係
  • normalized package name match
  • 一致条件: Libotr
Debian stable package indexes · deb.debian.org · Debian stable package indexes: libotr5-dev from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz
Debian apt95%

libotr5t64 4.1.1-6

Off-the-Record Messaging library

https://otr.cypherpunks.ca/

sudo apt install libotr5t64
  • Section: libs
  • Architecture: amd64
  • Source Package: libotr
  • 2 依存関係
  • 1 提供
  • 1 任意依存関係
  • normalized package name match
  • 一致条件: Libotr
Debian stable package indexes · deb.debian.org · Debian stable package indexes: libotr5t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz
Nix95%

libotr

nix profile install nixpkgs#libotr
  • normalized package name match
  • 一致条件: Libotr
nixpkgs package indexes · api.github.com · nixpkgs package indexes: pkgs/by-name/li/libotr/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1
Ubuntu apt95%

libotr5-bin 4.1.1-5.1build1

toolkit for Off-the-Record Messaging library

https://otr.cypherpunks.ca/

sudo apt install libotr5-bin
  • Section: universe/misc
  • Architecture: amd64
  • Source Package: libotr
  • 3 依存関係
  • normalized package name match
  • 一致条件: Libotr
Ubuntu 24.04 LTS package indexes · archive.ubuntu.com · Ubuntu 24.04 LTS package indexes: libotr5-bin from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz
Ubuntu apt95%

libotr5-dev 4.1.1-5.1build1

Off-the-Record Messaging library development files

https://otr.cypherpunks.ca/

sudo apt install libotr5-dev
  • Section: universe/libdevel
  • Architecture: amd64
  • Source Package: libotr
  • 2 依存関係
  • 1 任意依存関係
  • normalized package name match
  • 一致条件: Libotr
Ubuntu 24.04 LTS package indexes · archive.ubuntu.com · Ubuntu 24.04 LTS package indexes: libotr5-dev from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz
Ubuntu apt95%

libotr5t64 4.1.1-5.1build1

Off-the-Record Messaging library

https://otr.cypherpunks.ca/

sudo apt install libotr5t64
  • Section: universe/libs
  • Architecture: amd64
  • Source Package: libotr
  • 2 依存関係
  • 1 提供
  • 1 任意依存関係
  • normalized package name match
  • 一致条件: Libotr
Ubuntu 24.04 LTS package indexes · archive.ubuntu.com · Ubuntu 24.04 LTS package indexes: libotr5t64 from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz
apk95%

libotr 4.1.1-r5

Off The Record Messaging, an encryption library for secure IM conversations

http://otr.cypherpunks.ca/

sudo apk add libotr
  • License: LGPL-2.1-only
  • Architecture: x86_64
  • Source Package: libotr
  • 1 依存関係
  • 1 提供
  • normalized package name match
  • 一致条件: Libotr
Alpine Linux edge package indexes · dl-cdn.alpinelinux.org · Alpine Linux edge package indexes: libotr from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz
apk95%

libotr-dev 4.1.1-r5

Off The Record Messaging, an encryption library for secure IM conversations (development files)

http://otr.cypherpunks.ca/

sudo apk add libotr-dev
  • License: LGPL-2.1-only
  • Architecture: x86_64
  • Source Package: libotr
  • 1 依存関係
  • 1 提供
  • normalized package name match
  • 一致条件: Libotr
Alpine Linux edge package indexes · dl-cdn.alpinelinux.org · Alpine Linux edge package indexes: libotr-dev from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz
apk95%

libotr-doc 4.1.1-r5

Off The Record Messaging, an encryption library for secure IM conversations (documentation)

http://otr.cypherpunks.ca/

sudo apk add libotr-doc
  • License: LGPL-2.1-only
  • Architecture: x86_64
  • Source Package: libotr
  • normalized package name match
  • 一致条件: Libotr
Alpine Linux edge package indexes · dl-cdn.alpinelinux.org · Alpine Linux edge package indexes: libotr-doc from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz
apk95%

libotr-tools 4.1.1-r5

libotr tools

http://otr.cypherpunks.ca/

sudo apk add libotr-tools
  • License: LGPL-2.1-only
  • Architecture: x86_64
  • Source Package: libotr
  • 1 依存関係
  • 1 提供
  • normalized package name match
  • 一致条件: Libotr
Alpine Linux edge package indexes · dl-cdn.alpinelinux.org · Alpine Linux edge package indexes: libotr-tools from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz
dnf95%

libotr 4.1.1-25.fc44

Off-The-Record Messaging library and toolkit

http://otr.cypherpunks.ca/

sudo dnf install libotr
  • License: GPL-2.0-only AND LicenseRef-Callaway-LGPLv2
  • Category: Unspecified
  • Architecture: i686
  • Source Package: libotr
  • 6 依存関係
  • 3 提供
  • normalized package name match
  • 一致条件: Libotr
Fedora Rawhide package metadata · dl.fedoraproject.org · Fedora Rawhide package metadata: libotr from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst
dnf95%

libotr-devel 4.1.1-25.fc44

Development library and include files for libotr

http://otr.cypherpunks.ca/

sudo dnf install libotr-devel
  • License: GPL-2.0-only AND LicenseRef-Callaway-LGPLv2
  • Category: Unspecified
  • Architecture: i686
  • Source Package: libotr
  • 4 依存関係
  • 2 提供
  • normalized package name match
  • 一致条件: Libotr
Fedora Rawhide package metadata · dl.fedoraproject.org · Fedora Rawhide package metadata: libotr-devel from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst
pacman95%

libotr 4.1.1-6

Off-the-Record Messaging Library and Toolkit

https://otr.cypherpunks.ca/

sudo pacman -S libotr
  • License: GPL-2.0-only AND LGPL-2.1-only
  • Architecture: x86_64
  • 2 依存関係
  • normalized package name match
  • 一致条件: Libotr
Arch Linux sync databases · geo.mirror.pkgbuild.com · Arch Linux sync databases: libotr from https://geo.mirror.pkgbuild.com/extra/os/x86_64/extra.db.tar.gz
zypper95%

libotr-devel 4.1.1-4.12

Include files and development libraries

https://www.cypherpunks.ca/otr/

sudo zypper install libotr-devel
  • License: GPL-2.0-only AND LGPL-2.1-only
  • Category: Development/Libraries/C and C++
  • Architecture: x86_64
  • Source Package: libotr
  • 3 依存関係
  • 2 提供
  • normalized package name match
  • 一致条件: Libotr
openSUSE Tumbleweed package metadata · download.opensuse.org · openSUSE Tumbleweed package metadata: libotr-devel from https://download.opensuse.org/tumbleweed/repo/oss/repodata/be8d3611d25469107f32075a1697e69ec57a2b850b42348a658cc671ad5ec2b50760d02c3e59524d50da9a11d5be799bdaffba2e166e8ca8858512e3c0bd665d-primary.xml.zst
zypper95%

libotr-tools 4.1.1-4.12

"Off The Record" messaging library toolkit

https://www.cypherpunks.ca/otr/

sudo zypper install libotr-tools
  • License: GPL-2.0-only
  • Category: Development/Libraries/C and C++
  • Architecture: x86_64
  • Source Package: libotr
  • 3 依存関係
  • 1 提供
  • normalized package name match
  • 一致条件: Libotr
openSUSE Tumbleweed package metadata · download.opensuse.org · openSUSE Tumbleweed package metadata: libotr-tools from https://download.opensuse.org/tumbleweed/repo/oss/repodata/be8d3611d25469107f32075a1697e69ec57a2b850b42348a658cc671ad5ec2b50760d02c3e59524d50da9a11d5be799bdaffba2e166e8ca8858512e3c0bd665d-primary.xml.zst

パッケージグラフ

リンクは、ローカルのパッケージ関係グラフ、補足データ、依存関係、エコシステム一致、パッケージハブ所属から来ています。

関連ツール

  • libgcryptRuntime dependency declared by Homebrew.
  • libgpg-errorRuntime dependency declared by Homebrew.
  • mcabberPopular package that depends on this formula.
  • pidginPopular package that depends on this formula.
  • profanityPopular package that depends on this formula.

同じワークフロー

  • hblockShares av.db curated category or tags: cli, privacy, security.
  • mat2Shares av.db curated category or tags: cli, privacy, security.
  • botanShares av.db curated category or tags: cli, cryptography, security.
  • gnutlsShares av.db curated category or tags: cli, cryptography, security.
  • haitiShares av.db curated category or tags: cli, cryptography, security.
  • nettleShares av.db curated category or tags: cli, cryptography, security.

エージェント安全ガイド

ソース経路

リポジトリデータから生成

このページは scripts/generate-pkg-sqlite.py が生成した非公開のパッケージ SQLite アーティファクトから av-web によって提供されます。

使用ソース

  • Geiger risk classifier
  • Nucleus package database
  • av.db category and tag curation
  • cross-ecosystem install command graph
  • curated package history
  • external package-manager database matches
  • package relationship graph
  • package version freshness
  • package-page enrichment